fix: increase page size to 21 for speakers

[maze-runnar]

Fixes #4866
Making page size to 21 is giving better performance than 12 in terms of breaks while scrolling on a pageSize of 12 and total time also. And Also loads fast. So this is kind of trade of between total time and loading time I guess. So I found pageSize 21 as a best option.

Checklist

• I have read the Contribution & Best practices Guide.
• My branch is up-to-date with the Upstream development branch.
• The acceptance, integration, unit tests and linter pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
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[codecov]

Codecov Report

Merging #4932 into development will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff              @@
##           development    #4932   +/-   ##
============================================
  Coverage        22.85%   22.85%           
============================================
  Files              483      483           
  Lines             5123     5123           
  Branches            18       18           
============================================
  Hits              1171     1171           
  Misses            3948     3948           
  Partials             4        4           

Impacted Files	Coverage Δ
app/routes/public/speakers.js	33.33% <ø> (ø)

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[iamareebjamal]

I still think it doesn't trigger at the correct time but merging as a workaround for now. Let's see what else can be done later